Based on the information given regarding money, the correct option will be fractional reserve; paper money.
It should be noted that in the United States, there are banking institutions that hold reserves which is simply the fraction of deposits of other banks.
The fractional reserve is equal to the fraction of the bank's deposit liabilities that are owed to customers.
Therefore, a fractional reserve is a system where banks in the United States eventually figured out that they could print more paper money than the gold that they had in their vaults.
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